sci.crypt Google Group

Re: DES sbox correlation

2008-10-16T03:10:37Z

hence it only being a concept. at first glance it appears all well and good,
indepth it might be worth the while, or it might be complete crap. it is
afterall, not much different at all from a fully invertible single sbox.

Re: Changing the name of My OTP.

2008-10-16T03:06:05Z

Incorrect, there is either a fan or electrical or heat oscillation within
the box which many people use as a source of randomness. If there is no
random source then it is not a random stream, merely a pseudo-random stream
based on some criteria. A random stream has no criteria to generate a key.
What do you mean by severed?

Re: Any benefit to file obfuscation?

2008-10-16T02:48:09Z

Forgive me if I am mistaken here, but I am pretty sure that I read somewhere
that truecrypt is actually quite insecure.

Re: Any benefit to file obfuscation?

2008-10-16T02:46:31Z

Just because you can't determine where the keying is coming from, it does
not mean it is not there. Block1 XOR block2 XOR block3, from my limited
understanding, not only ensures that the entire message is there, but with a
simple checking function, will also determine if the message is authentic.

Re: Any benefit to file obfuscation?

2008-10-16T02:22:18Z

<snip a bunch of stuff>
I think the point Mr Ashwood is making, and I back him up on this. If the
start point is always the same AND you are storing the RNG values somewhere
(which, to put it bluntly, must be done for the obfuscation to be reversed
if you are using random values.) Then the obfuscation values would need to

Re: Another LibTomMath Bug - Exptmod_fast's use of mp_dr_reduce

2008-10-16T00:19:57Z

On Oct 15, 4:34 pm, Phil Carmody <thefatphil_demun...@yahoo.co. uk>
wrote:
When x = 1, the attributes of x in the mp_int struct are as follows:
Number of digits:
x->used = 1
x->alloc = number of allocated digits.... which is more than 1,
probably 32 or so
Digit values:
x->dp[0] = 1
x->dp[1] = uninitialized

Re: Any benefit to file obfuscation?

2008-10-15T23:59:04Z

Am 11 Oct 2008 18:12:12 GMT schrieb Orlan:
Use truecrypt.

Re: LibTomMath Bug - Exptmod_fast's use of mp_dr_reduce

2008-10-15T23:57:22Z

Double post, sorry.

Re: Another LibTomMath Bug - Exptmod_fast's use of mp_dr_reduce

2008-10-15T23:34:05Z

How are you defining "an uninitialised digit of x"?
Phil

LibTomMath Bug - Exptmod_fast's use of mp_dr_reduce

2008-10-15T22:45:58Z

I believe that I have found another bug, which happens when
expmod_fast is called with redmode = 1. The values that I am using
are:
(in hex)
x = 1
b = 4
c = CFFFFFFF
redmode = 1
and my DIGIT_BIT is 28
The problem that this causes is that mp_dr_reduce is called with an x
= 1, and an n = CFFFFFFF. When dr_reduce is called with an x that has

Another LibTomMath Bug - Exptmod_fast's use of mp_dr_reduce

2008-10-15T22:33:49Z

Re: Changing the name of My OTP.

2008-10-15T18:41:19Z

On Oct 12, 9:38 pm, "Antony Clements" <antony.cleme...@bigpond.com>
wrote:
Actually, no. True is hard to catch but largely defined by your
choice of method. But, you might derive more random streams from less
random streams by any number of processes. This goes to my other
recent objection that being that making your keys was and had to be

Re: DES sbox correlation

2008-10-15T18:25:16Z

You need to think this through. A mature / considered design has few
features that do not improve security and no features that appear to add
complexity but in reality don't add security.

VipIMAGE 2009 – ECCOMAS Thematic Conference - FIRST ANNOUNCE

2008-10-15T17:51:35Z

------------------------------ ------------------------------ ------------------------------ ------------------------------ -----------
(Apologies for cross-posting)
International ECCOMAS Thematic Conference VipIMAGE 2009 - II ECCOMAS
THEMATIC
CONFERENCE ON COMPUTATIONAL VISION AND MEDICAL IMAGE PROCESSING

Re: Any benefit to file obfuscation?

2008-10-15T17:45:49Z

So there's no point to obfuscation. We knew that. Why bother saying it
five times?
Postings to sci.crypt count negatively in the Cryptography Grand Prix,
because encouraging trolls like this is constitutes attempted denial of
service on intelligent discourse.